Non-metal elements are Noble gases,Halogens,nonmetals,semimetals(metalloids). ( and maybe other metals)
Answer:
I feel that "The Mesosaurus could not swim between the continents in the open ocean, so the fossils
show that the continents must have been together in the past." Is the best answer.
Explanation:
Because this is a true statement and even scientists belive this is true.
Answer:
Ionic bonds transfer electrons and covalent bonds share electrons.
Explanation:
Ionic bonds tend to transfer electrons completely. Take NaCl for example.
Cl has 7 valence electrons.
Na has 1 valence electron.
To stabilize themselves, either with a full 8 shells or full outer shell, Cl wants 1 electron and Na wants to lose 1 electron. So when NaCl forms, Na donates its electron to Cl.
In a covalent bond, the electrons are shared. Water can be used as an example. The electrons in water usually are around the oxygen, but sometimes it is around the hydrogens.
Explanation:
1) Amphoteric substances can react both like an acid or a base depending if they are in presence of a base or an acid.
Zinc hydroxide (Zn(OH)2):
In acid: 
In base: ![Zn(OH)_2 + 2 NaOH \longrightarrow Na_2[Zn(OH)_4]](https://tex.z-dn.net/?f=Zn%28OH%29_2%20%2B%202%20NaOH%20%5Clongrightarrow%20Na_2%5BZn%28OH%29_4%5D)
Aluminium hydroxide (Al(OH)3)
In acid: 
In base: ![Al(OH)_3 + NaOH \longrightarrow Na[Al(OH)_4]](https://tex.z-dn.net/?f=Al%28OH%29_3%20%2B%20NaOH%20%5Clongrightarrow%20Na%5BAl%28OH%29_4%5D)
2) Reactions
a) 
b) 
